MEDIUM
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The rate constant for a chemical reaction has units L mol-1s-1,order of the reaction will be

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Important Questions on Chemical Kinetics

EASY
The rate constant for a first order reaction is 7.0×10-4 s-1. If initial concentration of the reactant is 0.080 M, what is the half-life of the reaction?
EASY
A+2BC , the rate equation for the reaction is given as

Rate =k[A][B]

If the concentration of A is kept the same but that of B is doubled what will happen to the rate itself?
EASY
If 50 % of a reaction occurs in 100 second and 75 % of the reaction occurs in 200 second, the order of this reaction is:
MEDIUM
Mechanism of a hypothetical reaction X2+Y22XY is given below:

(i) X2X+X fast

(ii) X+Y2XY+Y slow

(iii) X+YXY fast

The overall order of the reaction will be
HARD

For an elementary chemical reaction, A2 k-1k12A , the expression for dAdt is:

HARD
In the reaction,

P + Q R + S

the time taken for 75% reaction of P is twice the time taken for 50% reaction of P. The concentration of Q varies with reaction time as shown in the figure.The overall order of the reaction is:

Question Image  
EASY
When initial concentration of a reactant is doubled in a reaction, its half-life period is not affected. The order of the reaction is:
MEDIUM
The rate constant for the first order reaction is 60 s-1. How much time will it take to reduce the concentration of the reactant to 116 th value?
HARD
For a first order reaction A(g)  2B(g) + C(g) at constant volume and 300 K, the total pressure at the beginning (t = 0) and at time are  p0 and pt, respectively. Initially, only A is present with concentration  A0, and  t13  is the time required for the partial pressure of A to reach 1/3rd of its initial value. The correct option(s) is (are)
(Assume that all these gases behave as ideal gases)
EASY
The rate constant of the reaction AB is 0.6×10-3 mole per liter per second. If the initial concentration of A is 5 M, then the concentration of B after 20 minutes is:
EASY
A first-order reaction has a specific reaction rate 10-2sec-1. How much time will it take for 20 g the reactant to reduce to 5 g?
EASY
Decomposition of X exhibits a rate constant of 0.05μg/year. How many years are required for the decomposition of 5μg of X into 2.5μg?
HARD
The half-life period of a first-order reaction is 15 minutes. The amount of substance left after one hour will be
EASY
Which among the following reactions can be an example of pseudo first order reaction?
HARD
At 518oC, the rate of decomposition of a sample of gaseous acetaldehyde, initially at a pressure of 363Torr was 1.00 Torr s-1 when 5% had reacted and 0.50 Torr s-1 when 33% had reacted. The order of the reaction is:
EASY
The rate law for the reaction below is given by the expression kA[B]

A+BProduct

If the concentration of B is increased from 0.1 to 0.3 mol, keeping the value of A at 0.1 mol, the rate constant will be:
MEDIUM
Decomposition of H2O2 follows a first order reaction. In fifty minutes the concentration of H 2 O 2 decreases from 0.5 to 0.125 M in one such decomposition. When the concentration of H2O2 reaches 0.05 M , the rate of formation of O2 will be:
HARD
The reaction 2N2O5g4NO2g+O2(g) follows first order kinetics. The pressure of a vessel containing only N2O5 was found to increase from 50 mm Hg to 87.5 mm Hg in 30 min. The pressure exerted by the gases after 60 min. Will be (Assume temperature remains constant) :
MEDIUM
For the reaction, 2A+B products, when the concentration of A and B both were doubled, the rate of the reaction increased from 0.3 mol L-1s-1 to 2.4 mol L-1s-1.  When the concentration of A alone is doubled, the rate increased from 0.3 mol L-1s-1 to 0.6 mol L-1s-1.

Which one of the following statements is correct?
MEDIUM
The rate of a first-order reaction is 0.04 mol l-1s-1 at 10 second and 0.03 mol l-1s-1 at 20 seconds after initiation of the reaction. The half-life period of the reaction is: